▎ 摘　　要

Inventive designs for DNA-based electrochemical sensing are emerging tremendously in recent years. Herein, we report a label free ionic liquid (1-butyl-3-methylimidazolinium tetrafluoroborate) modified nitrogen doped graphene electrode as a potential platform for the electrochemical discrimination of complementary and non-complementary DNA sequences. The proposed platform holds a great promise for the rapid and selective hand-held detection of DNA sequences with a sensitivity and detection limit of 0.202 mu A/nM/mm(2) and 8.12 nM respectively, without any expensive labeling and cross-hybridization artifacts. (C) 2017 Elsevier B.V. All rights reserved.